Receiving Circuit, Transmitting Circuit, Micro-Controller and Method for Power Line Carrier Communication

1. A micro-controller, comprising a central processor, and further comprising a receiving circuit, wherein the receiving circuit comprises: an analog amplifier, configured to connect with a power line coupling circuit, receive a power line carrier signal, and amplify the power line carrier signal; a receiving filter which connects with the analog amplifier, configured to filter the power line carrier signal output by the analog amplifier; an analog-to-digital converter which connects with the receiving filter, configured to convert the filtered power line carrier signal output by the receiving filter into digital signals; a digital mixer which connects with the analog-to-digital converter, configured to mix the digital signals; a digital filter which connects with the digital mixer, configured to filter the mixed digital signals output by the digital mixer; a digital demodulator which connects with the digital filter, configured to perform FSK demodulation or PSK demodulation on the digital signals filtered by the digital filter, and output the demodulated signal; and the central processor connects with the digital demodulator of the receiving circuit, and is configured to provide a demodulation control signal to the digital demodulator, so that the digital demodulator selects an FSK demodulation mode or a PSK demodulation mode.

2. The micro-controller according to claim 1 , wherein the receiving circuit further comprises: a primary amplifier, a bandpass filter, and a secondary amplifier; the primary amplifier connects with the receiving filter, and is configured to amplify the power line carrier signal output by the receiving filter; the bandpass filter connects with the primary amplifier, and is configured to filter the power line carrier signal amplified by the primary amplifier; and the secondary amplifier connects with the bandpass filter and the analog-to-digital converter, and is configured to amplify the power line carrier signal filtered by the bandpass filter and transmit the amplified power line carrier signal to the analog-to-digital converter.

3. The micro-controller according to claim 1 , wherein the receiving circuit further comprises: a demodulation control register; the demodulation control register connects with the central processor; the demodulation control register connects with the digital demodulator, the digital filter, and the digital mixer, and is configured to provide the demodulation control signal to the digital demodulator and provide a filtering parameter and a mixing parameter corresponding to the demodulation control signal to the digital filter and the digital mixer.

4. The micro-controller according to claim 1 , wherein the receiving circuit further comprises: an energy calculation module which connects with the digital demodulator, configured to calculate an energy value of the signal demodulated by the digital demodulator; and an automatic gain control module which connects with the energy calculation module and the analog amplifier, configured to generate an amplification parameter control signal according to the energy value of the signal calculated by the energy calculation module, and provide the amplification parameter control signal to the analog amplifier, to adjust an amplification parameter of the analog amplifier.

5. The micro-controller according to claim 2 , wherein the receiving circuit further comprises: an energy calculation module which connects with the digital demodulator, configured to calculate an energy value of the signal demodulated by the digital demodulator; and an automatic gain control module which connects with the energy calculation module and the analog amplifier, configured to generate an amplification parameter control signal according to the energy value of the signal calculated by the energy calculation module, and provide the amplification parameter control signal to the analog amplifier, to adjust an amplification parameter of the analog amplifier.

6. The micro-controller according to claim 3 , wherein the receiving circuit further comprises: an energy calculation module which connects with the digital demodulator, configured to calculate an energy value of the signal demodulated by the digital demodulator; and an automatic gain control module which connects with the energy calculation module and the analog amplifier, configured to generate an amplification parameter control signal according to the energy value of the signal calculated by the energy calculation module, and provide the amplification parameter control signal to the analog amplifier, to adjust an amplification parameter of the analog amplifier.

7. The micro-controller according to claim 1 , further comprising a transmitting circuit; the transmitting circuit comprises: a digital modulator, a gain controller, a digital-to-analog converter, a transmitting filter, and a transmitting amplifier connected successively; the digital modulator is configured to perform FSK modulation or PSK modulation on received digital signals; the gain controller is configured to amplitude-adjust the modulated signals output by the digital modulator; the digital-to-analog converter is configured to convert the amplitude-adjusted digital signals output by the gain controller into an analog signal; the transmitting filter is configured to filter the analog signal output by the digital-to-analog converter; and the transmitting amplifier is configured to amplify the filtered analog signal output by the transmitting filter to form a power line carrier signal and output the power line carrier signal; and the central processor connects with the digital modulator of the transmitting circuit, and is configured to provide a modulation control signal to the digital modulator, so that the digital modulator selects an FSK modulation mode or a PSK modulation mode.

8. The micro-controller according to claim 7 , wherein the transmitting circuit further comprises: a modulation control register; the modulation control register connects with the central processor; the modulation control register connects with the digital modulator and the gain controller, and is configured to provide the modulation control signal to the digital modulator, to control the digital modulator to perform FSK modulation or perform PSK modulation and provide an amplification parameter corresponding to the modulation control signal to the gain controller.

9. A method for power line carrier communication, which is implemented based on the micro-controller according to claim 1 , comprising: reading, by the central processor, a demodulated signal in a demodulation control register; and transmitting a demodulation control signal to the demodulation control register when it is decided, by the central processor, that the demodulated signal does not match a default signal form, to change an FSK demodulation mode or a PSK demodulation mode for a receiving circuit and perform demodulation on a power line carrier signal.

10. A method for power line carrier communication, which is implemented based on the micro-controller according to claim 1 , comprising: receiving, by the receiving circuit, a demodulation control signal sent by a demodulation control register; and changing a current demodulation mode according to the demodulation control signal, to perform FSK demodulation or PSK demodulation on a received power line carrier signal, wherein the demodulation control signal is generated when it is decided, by the central processor, that a demodulated signal form does not match a default signal form.